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diff --git a/gfx/angle/checkout/src/compiler/translator/VersionGLSL.h b/gfx/angle/checkout/src/compiler/translator/VersionGLSL.h
new file mode 100644
index 0000000000..706e9125e1
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+++ b/gfx/angle/checkout/src/compiler/translator/VersionGLSL.h
@@ -0,0 +1,76 @@
+//
+// Copyright 2002 The ANGLE Project Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+//
+
+#ifndef COMPILER_TRANSLATOR_VERSIONGLSL_H_
+#define COMPILER_TRANSLATOR_VERSIONGLSL_H_
+
+#include "compiler/translator/tree_util/IntermTraverse.h"
+
+#include "compiler/translator/Pragma.h"
+
+namespace sh
+{
+
+static const int GLSL_VERSION_110 = 110;
+static const int GLSL_VERSION_120 = 120;
+static const int GLSL_VERSION_130 = 130;
+static const int GLSL_VERSION_140 = 140;
+static const int GLSL_VERSION_150 = 150;
+static const int GLSL_VERSION_330 = 330;
+static const int GLSL_VERSION_400 = 400;
+static const int GLSL_VERSION_410 = 410;
+static const int GLSL_VERSION_420 = 420;
+static const int GLSL_VERSION_430 = 430;
+static const int GLSL_VERSION_440 = 440;
+static const int GLSL_VERSION_450 = 450;
+
+int ShaderOutputTypeToGLSLVersion(ShShaderOutput output);
+
+// Traverses the intermediate tree to return the minimum GLSL version
+// required to legally access all built-in features used in the shader.
+// GLSL 1.1 which is mandated by OpenGL 2.0 provides:
+//   - #version and #extension to declare version and extensions.
+//   - built-in functions refract, exp, and log.
+//   - updated step() to compare x < edge instead of x <= edge.
+// GLSL 1.2 which is mandated by OpenGL 2.1 provides:
+//   - many changes to reduce differences when compared to the ES specification.
+//   - invariant keyword and its support.
+//   - c++ style name hiding rules.
+//   - built-in variable gl_PointCoord for fragment shaders.
+//   - matrix constructors taking matrix as argument.
+//   - array as "out" function parameters
+//
+// TODO: ES3 equivalent versions of GLSL
+class TVersionGLSL : public TIntermTraverser
+{
+  public:
+    TVersionGLSL(sh::GLenum type, const TPragma &pragma, ShShaderOutput output);
+
+    // If output is core profile, returns 150.
+    // If output is legacy profile,
+    //   Returns 120 if the following is used the shader:
+    //   - "invariant",
+    //   - "gl_PointCoord",
+    //   - matrix/matrix constructors
+    //   - array "out" parameters
+    //   Else 110 is returned.
+    int getVersion() const { return mVersion; }
+
+    void visitSymbol(TIntermSymbol *node) override;
+    bool visitAggregate(Visit, TIntermAggregate *node) override;
+    bool visitGlobalQualifierDeclaration(Visit, TIntermGlobalQualifierDeclaration *node) override;
+    void visitFunctionPrototype(TIntermFunctionPrototype *node) override;
+    bool visitDeclaration(Visit, TIntermDeclaration *node) override;
+
+  private:
+    void ensureVersionIsAtLeast(int version);
+
+    int mVersion;
+};
+
+}  // namespace sh
+
+#endif  // COMPILER_TRANSLATOR_VERSIONGLSL_H_